# i=1
# i<5打印O直到5
# while i<=20:
#     j=1
#     while j<=20:
#         print("*",end=" ")
#         j+=1
#     print("")
#     i+=1

# 每行打印多少个通过i控制,多少行通过print跳下一行打印加一

i=1

while i<=12:
    k=1
    while k <=i:
        print("xx",end="t")
        k+=1
    print()
    i+=1
    xtt+=2
